What does the expression 'the new black' mean?

What does the expression 'the new black' mean?

The "new black" applies to a sort of key colour for the season that's almost overtaken black so there's lots of it around. Predominantly black is considered to be a staple in most people's wardrobes. Which means black is a general colour, and you can add other bits of colour to it, and create lots of versatility, but every season now that other colour, the new black, changes. For instance, next season it may be brown that is a big staple colour, so that would be considered to be the "new black." So that would be your staple colour and you will add other different colours to that to create your versatility, so that's what "the new black" applies to.